Anions in surface, ground, mineral, borehole and pure waters - Determination of Anions in Natural and Treated Waters - page 453

6.1.7 Phosphate
6.1.7.1 Ion chromatography
The application of this technique is discussed under multianion analysis in sections
6.1.13.1 and 12.5.1.
6.1.8 Sulphate
6.1.8.1 Flow injection analysis
The method involving the formation of a methylthymol blue complex with barium,
described in sections 5.1.11.3 and 6.1.13 has been applied to the determination of 1-10
[33] or 100-1000mg L −1 [34] of sulphate in surface waters.
6.1.8.2 Atomic absorption spectrometry
Little et al. [10] have described a method for the determination of 1mg L −1 (asS) sulphate
in surface waters in which the sulphate is precipitated vs lead sulphate in 40% aqueous
ethanol medium in excess lead chloride. Unconsumed lead is determined by atomic
absorption spectrometry with an air-coal gas flame. Lead recoveries are 95% at the 1mg
L −1 sulphate (asS) level and 99-100% at higher sulphate levels. The only interference
found was from phosphate amounts exceeding 10mg L −1 (asP) which could be overcome
by the addition of aluminium nitrate.
6.1.8.3 Ion chromatography
The application of this technique is discussed under multianion analysis in sections
6.1.13.1 and 12.5.1.
6.1.9 Sulphide
6.1.9.1 Miscellaneous
The application of this technique is discussed under multianion analysis in section
14.12.3.1.
6.1.10 Sulphite
6.1.10.1 Miscellaneous
The application of this technique is discussed under multianion analysis in section
14.12.3.1.